4º To determine exactly and analyse the liquids contained in the breasts of the dam, and the digestive organs of the mammary foetus. 5º To examine in the living subjects the remarkable arrangement of the respiratory organs, discovered by Geoffroy Saint-Hilaire, which establish a connexion between the posterior nostrils and the cavity of the larynx. We are entirely without notions concerning the abdominal folds, which, in this kind, take the place of the pouch, in a certain degree, and know nothing of the modifications these folds pass through in the different epochs of gestation. _Anthropology_.--The countries to which these instructions are adressed to are doubtless among those where naturalists can collect the greatest number of interesting facts for this branch of natural history, formerly neglected and to which has been given, for some years past, an impulse worthy of its high importance. In Mexico and in the United States three of the principal human races are found together; the race peculiar to America, the Caucasian race from different countries of Europe, and the Ethiopian carried over in its train. All these races cross-breed, and from the crossing of the half-breeds with them and each other, result many curious combinations, whose scientific study is of the highest interest. It has unhappily been, for a longtime, as difficult as it is important. If the plain and marked characteristics of the two animal species often disappear; if a skilful analysis, enlightened by direct comparison with analogous objects, can alone discover them, how can the anthropologist size between two neighbouring types, express and transmit by description, light, fleeting distinctions, some times invisible for him, who has not the habit of observing them? Three inventions or new application, made almost simultaneously, have happily removed part of the great difficulties, and opened a new era in the natural history of man; the daguerreotype, which fixes and engraves with geometrical precision, the general shape of the body and the features of the face; the Cephalometer of Antelme M. D. which measures and sketches with a process almost as exact, the dimensions and forms of the head, and enables one to determine, as nearly as possible, the mean dimensions and typical form of the head of a people the sex and age: in fine, the perfection and happy application to anthropology of the process of moulding, performed directly, or by the aid of the ingenious physonotype of M. Sauvage; a process by which the whole head and, if necessary, the members of the body are preserved and placed before our eys.